GSAT-7R (CMS-03): India’s Heaviest Communication Satellite

ISRO successfully launched the CMS-03 communication satellite (GSAT-7R) using the LVM3-M5 rocket from Satish Dhawan Space Centre in Sriharikota.

About GSAT-7R (CMS-03)

Communication Satellite (CMS-03), also called GSAT-7R, is a multi-band military communications satellite equipped with advanced encryption and anti-jamming features.
The satellite replaces the ageing GSAT-7 “Rukmini”, which has been serving the Indian Navy since 2013.
The satellite was launched aboard the Launch Vehicle Mark 3 (LVM3-M5) — India’s most powerful operational rocket, often nicknamed “Bahubali” for its strength and reliability with a 100% success rate in heavy-lift missions.
- The rocket employs a three-stage propulsion system combining a solid booster, a liquid core, and a cryogenic upper stage.
At 4,400 kg, GSAT-7R is India’s heaviest and most powerful communication satellite to date, placed in a Geosynchronous Transfer Orbit (GTO). Its massive payload capacity allows for expanded bandwidth, improved coverage, and enhanced data transmission speed — all vital for defence communication.
One of the satellite’s primary roles is to boost communication for India’s naval forces. It ensures secure, high-speed voice, data, and video connectivity across ships, submarines, and aircraft — extending up to 2,000 km from India’s coastline.
Maritime Connectivity: It offers secure, high-speed voice, data, and video communication up to 2,000 km from India’s coastline.
GSAT-7R carries multi-band transponders operating in:
- UHF (Ultra High Frequency): For long-range and ship-to-submarine communication,
- S-Band and C-Band: For stable data and voice transmission,
- Ku-Band: For high-speed multimedia and real-time video communication.
Significance: With GSAT-7R, India enhances its ability to monitor, coordinate, and respond swiftly across domains — sea, air, and land.
- It also marks another step in Atmanirbhar Bharat, as India strengthens its indigenous capabilities in space-based defence technology.